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Method for avoiding unnecessary excessive stay of short cycle in discontinuous reception mechanism

a technology of discontinuous reception and short cycle, applied in power management, instruments, high-level techniques, etc., can solve the problems of waste of ue power, delay in switching between two drx cycles, etc., and achieve the effect of avoiding unnecessary excessive stay of short cycl

Active Publication Date: 2009-09-24
HFI INNOVATION INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method for avoiding unnecessary excessive stay of short cycle in discontinuous reception mechanism in E-UTRA network environment. The method involves using an inactivity timer and a short cycle timer to determine when a user equipment should be actively monitoring the PDCCH. The inactivity timer is stopped when the user equipment receives a discontinuous reception command, and the short cycle timer is started. The user equipment uses the short cycle when the inactivity timer expires and the short cycle timer does not expire, or uses the long cycle when the short cycle timer expires and the inactivity timer does not expire. This method helps to optimize the user equipment's behavior and improve network efficiency.

Problems solved by technology

But there are still some problems left either may lead to unwanted result, or not clearly specified.
As can be observed, it is possible now that the switching between two DRX cycles would be delayed for a long period of time, which may be unnecessary.
This could be a waste of UE power since the UE should better stay in long DRX cycle to avoid unnecessary wake-up in such situation.

Method used

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  • Method for avoiding unnecessary excessive stay of short cycle in discontinuous reception mechanism

Examples

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first embodiment

[0032]To avoid such excessive stay of short cycle, FIG. 6 illustrates the flow chart of the method for avoiding unnecessary excessive stay of short cycle in discontinuous reception mechanism with which the short cycle timer 53 never stops before expiration. In the method, at first, the user equipment 51 uses the short cycle 55 while the short cycle timer 53 is running (step S601). Then, it determines whether the inactivity timer 52 expires or not and whether the short cycle timer 53 expires or not (step S602). If the inactivity timer 52 expires but the short cycle timer 53 does not expire, the user equipment 51 uses the short cycle 55 (step S603). If the short cycle timer 53 expires but the inactivity timer 52 does not expire, the user equipment 51 uses the long cycle 55 (step S604). If the inactivity timer 52 and the short cycle timer 53 expire at the same time, the user equipment 51 selects the short cycle 55 or the long cycle 56 for use based on a priority assignment (step S605)....

second embodiment

[0034]With reference to FIG. 7, there is shown the flow chart of a method for avoiding unnecessary excessive stay of short cycle in discontinuous reception mechanism in accordance with the present invention. As shown, the method begins by determining whether the inactivity timer 52 is stopped before expiration (step S701). If the inactivity timer 52 is not stopped before expiration, process goes to step S705 for performing the discontinuous reception mechanism for determining whether to monitor PDCCH or not. If the inactivity timer 52 is stopped before expiration, it further determines whether the short cycle 55 is configured (step S702) or not. If the short cycle 55 is configured, the user equipment 51 uses the short cycle 55 and enables the short cycle timer 53 (step S703) and then process goes to step S705 for performing the discontinuous reception mechanism for determining whether to monitor PDCCH or not. On the contrary, if the short cycle 55 is not configured, the user equipme...

third embodiment

[0036]With reference to FIG. 8, there is shown the flow chart of a method for avoiding unnecessary excessive stay of short cycle in discontinuous reception mechanism in accordance with the present invention. As shown, the method begins by determining whether the inactivity timer 52 is stopped before expiration (step S801). If the inactivity timer 52 is not stopped before expiration, process goes to step S805 for performing the discontinuous reception mechanism for determining whether to monitor PDCCH or not. If the inactivity timer 52 is stopped before expiration, it further determines whether the short cycle 55 is used (step S802) or not. If the short cycle 55 is used, the user equipment 51 uses the short cycle 55 and starts the short cycle timer 53 (step S803) and then process goes to step S805 for performing the discontinuous reception mechanism for determining whether to monitor PDCCH or not. On the contrary, if the short cycle 55 is not used, the user equipment 51 uses the long...

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PUM

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Abstract

A method for avoiding unnecessary excessive stay of short cycle in discontinuous reception mechanism begins by using the short cycle while the short cycle timer is running. Then, it determines whether the inactivity timer expires or not and whether the short cycle timer expires or not. If the inactivity timer expires but the short cycle timer does not expire, the short cycle is used. If the short cycle timer expires but the inactivity timer does not expire, the long cycle is used. If the inactivity timer and the short cycle timer expire at the same time, either the short cycle or the long cycle is selected for use.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of the filing date of U.S. Provisional Application Ser. No. 61 / 064,706, entitled “A DISCONTINUOUS RECEPTION MECHANISM” filed Mar. 21, 2008, under 35 USC & 119(e)(1).BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a discontinuous reception mechanism and, more particularly, to a method for avoiding unnecessary excessive stay of short cycle in discontinuous reception mechanism.[0004]2. Description of Related Art[0005]There are only two different Radio Resource Control (RRC) states, RRC_IDLE and RRC_CONNECTED, in Evolved Universal Terrestrial Radio Access (E-UTRA), unlike the four different RRC connected states adopted in Universal Mobile Telecommunication System (UMTS). In order to achieve better user equipment (UE) power saving while preventing unnecessary UE state transitions between RRC_IDLE and RRC_CONNECTED, Discontinuous Reception (DRX) is introduced in...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G08C17/00
CPCH04W24/00H04W76/048H04W52/0216H04W76/28Y02D30/70
Inventor WU, CHUNLILU, TSUNG-LIANGCHEN, YEN-CHENCHANG, CHIH-WENKUO, CHIEN-CHENG
Owner HFI INNOVATION INC
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